title: Broadband converging plano-concave lens.
abstract: A plano-concave lens with source-tailored geometric profile and transformational gradient index is proposed for broadband illumination. Such a design, capable of focusing and collimating the electromagnetic fields, fulfils the functionality of a converging lens and can also achieve a steerable beam and multiple beams efficiently. Nonresonant synthesis with a perforated dielectric plate and dielectric rod arrays is demonstrated for the lensing realization, promising a wide operating frequency band in the practical implementation.
authors.affiliation: School of Electronic Engineering, Xidian University, Xi’an 710071, China. ruiyang.xidian@gmail.com
authors.forename: Rui
authors.initials: R
authors.lastname: Yang
authors.forename: Zhenya
authors.initials: Z
authors.lastname: Lei
authors.forename: Lei
authors.initials: L
authors.lastname: Chen
authors.forename: Jiawei
authors.initials: J
authors.lastname: Zhang
authors.forename: Zhaoxu
authors.initials: Z
authors.lastname: Wang
authors.forename: Yongjun
authors.initials: Y
authors.lastname: Xie